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A pair of helical gears consist of 25 teeth pinion gear meshing with a 90 teeth gear. Calculate the wear strength If surface hardness is 260BHN. Also face width=35mm, module=4mm and helix angle=25⁰.

(a) 443.5N

(b) 1125.6N

(c) 7971.9N

(d) 1014.2N

I got this question in previous year papers.

I am preparing the Rolling Contact Bearings, Spur Gears and Helical Gears section in section Rolling Contact Bearings, Spur Gears and Helical Gears of Machine Design

1 Answer

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by (52.6k points)
Accurate answer is (c) 7971.9N

Illuminate the topic with: S=bQdK/cos²Ɯ where Ɯ=25⁰, d=zm/cosƜ, Q=2×90/90+25, K=0.16x[BHN/100]².

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